Internal pipe-painting device



Feb. 4, 1930. M. P. COTTON 1,746,071

INTERNAL PIPE PAINTING DEVICE Filed Jan. 50, 1928 Affomey.

Patented Feb. 4, 1930 f mre sm'rlzs j A 1,74ae71 CoTToN LIMITED, orVANCOUVER, BRITISH COLUMBIA, ANADA i INTERNAL Application file d January30, 1928; Serial No. 250,522

This invention relates to a painting device for use in coating theinternal pipes or conduits.

tachment which may be-readily placed in position forfpainting, and whichwillgive.v a uniforml distributed coatingtofthe inter nal surface of thepipe without anyjwaste of coating material;

- The device consists essentially of a tube of the same size as thepipes it is intended to 7 coat, provided with amovablecentral grodcarrying material, two of these being fixed rigidly tov the rod and .thethird slidably mounted therefrom. I r

1 Y The cylindrical space inside the pipe be and sliding plunger formsatween the fixed chamber or reservoir for the coating mate-' rial, whichis introduced through a revolving sleeve aperture in the side of thetube, which is opened to allow the coating material, in liquid form, tobe inserted and thereupon A closed. The attachment is then mounted uponM then passed through the pipe from .the far posite'd evenly overtrestles or other suitable supports so that its axis is approximatelyhorizontal, and the pipe to be internally painted is inserted in theenlarged end of the attachment and supported so that it is in axialalignment therewith. A rod somewhat longer than the pipe is endand'secured to the end of the central rod of the attachment. The rodsdrawn right through the pipe to the far end,

carrying with them the plungers and the coating material between, whichis thereby dethe internal surface of thepipe. 1

' The sliding plunger is constrained by a stop collar onthe central rod,but can move towards the fixed plungers and the, coating material isplaced between the sliding plunger and. the first fixed plungers. Theobject of this construction istoallow for the diminution in volume ofthe coating material in the chamber as it is deposited upon the insideof the pipe, as the approach of the sliding plunger tothe fixed plungerof the chamber containing the coatingmaterial and thus forces thismaterial to be always three washers or plungers of fibrous f are thendiminishes the length PIPE-PATNTING' DEVICE tral rod and plungersreplaced in the attach- MILES r. CoTToN, or VANCOUV R; BRITIsHCoLUMBIA,CANADA, AssIGNoaToyn mse:

1n contactwith the internal surface of the surfaces of Ip' Its object isthe provision of a simply constructed and inexpensive at-' 1P8. v by byb After the rods. and plungers have been pulled through, the pipe isreinoved,the cen- V I ment,.thesupply of coating replenished, an-f otherpipe placed in position, and the opera-' tion repeated as often-asrequired.

The details .of the invention are more ly described by thedrawingsherewith formpart of this application and in which: 1g.

inglthe fixedand sliding plungers, the-central rod andthe hookattachment for the pipe rod.v

Fig. '2 is ofrotating the revolving-sleeve or door by clear-xviewshowing the method I means of a handle,:therotating and end move.ments of the-sleeve beingcontrolled 'by'means I In these drawings 3indicates the tubular.

1 is a section through the deviceshowbo'dvjof the device, provided withan enlarged endA into whicha pipe of the same internal diameter as thetube3 can be inserted.

YEA sleeveb is revolvably mounted uponthe tube '3 and'is providedwith aslot or opening- 6 corresponding in the tube. This in size. with. theslot 7 cut sleeve can be revolved upon v the body by the handle: 9 untilthe openings.

7 -and'6 coincide, the body being steadied and ifsg,

prevented from revolving by -thehandle8 v I A rod 10 is.centrallymounted in-thetube and Carries three plungers ll, 12 and 13 offelt or other suitable'fibrous material. The!" plungers 1-1 and 12 areadjustably fixed in;

position on the rod by means of lock-nuts and washers,-but the plunger13 is slidably mounts,

ed thereonand can move uponthe rod 10 between: the A stop collar 16 andthefixed Washer 12.? The rod 0 ends in a-hook l ijbyqwhich it can becausj'ed to m v axially; along the The coating chamber 17-,formed bythetube 3, the fixed washer12 'and'the slidable washer 13, and

whenthis chamber is filled and the-door closed by revolving. the sleeve:5, one end of material is introduced into the thepipe to befcoated'isinserted in the end i 4 and supported 1n 7 s line withthe tube 3,andf. aqn re 15 Me se th ugh h p p rom;-

the far end and engaged with the hook 4. piston,

attachable and "detachable means The rods 15 and 10 are then drawnthrough whereby said pistons and said brush may be the inside of thepipeto be painted, carrying drawnthrough said tube.

In testimony whereof Iaflix my signature.

with them the coating material which is compressed between the fixedplunger 12 and the sliding plunger 13 and forced out into contact withthe internal surface of the pipe. The fixed plunger 11 follows theplunger 12 and removes any excess of coating from the pipe surface. I

For adjusting the size of the paint chamber to contain just sufficientcoating for varying V 7 lengths of pipes, the plunger 12 can be alteredin position upon therod 10 by means-of lock-nuts, so that waste ofcoating material can be eliminated.

Having now particularly described my invention, what I claim and desireto be protectedin by Letters Patent, is:

1. In a device for painting the inner sur face of tubes the'combinationcomprising, a tubular member adapted to'engageably connect with so as toform an extension of the tubular member to be painted, a pair of pistonsapproximately fitting and slidable within the interior of the said"members, said pistons being connected together but spaced apart to forma cylindrical cavity adapted to v 7 receive the paint medium, anaperture in the said tubularmember adapted for the intro duction ofpainting medium into the said cavity, a closure member for the saidaperture, a disc. brush memberfitting and slid able within theinteriorof the said tubular member, said brush member being connected tobut spaced apart from one of the said pistons, attachable and detachablemeans for drawing said pistons and said brush through said tubularmember to-be painted whereby the painting medium contained within saidcavity exuding around the periphery ofthe said piston is spread evenlyupon the interior surface of the tube under operation.

.2. In a device forpainting the-inner surface oftubes the combinationcomprising, a

tubular member adapted to engageably connect with so as to form anextension of the tube to be painted, an external aperture in the saidtubular member adapted for the introduction of the painting medium, aclosure member for the said aperture, a pair of pistons approximatelyfitting and slidable with in the interior of the said member and thesaid tube, a rod central of said member and passing-through saidpistons, a shoulder on" said rod, one of said pistons being slidableupon said rodand abutting against said shoulder, the other said pistonbeing in fixed relation with said rod, the two said pistons I I with thesaid member thus j forming a selfadjustable cylindrical cavity for thereception and delivery respectively of the painting medium within thesaid tubular member and the said tube, a shallow cylindrical brushsecured to said rod and spaced apart from said fixed

